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The Astrodymium Ring System is a complete mounting and autofocusing solution designed for the Rokinon/Samyang 135mm F2 lens – the perfect choice for astrophotographers seeking precision and convenience.
Now fully compatible with the latest ZWO EAFN and EAF-Pro models!
This system enables easy integration of a ZWO ASIAIR, EAF (EAFN/EAF-Pro), and a guidescope with the 135mm lens, creating a powerful setup for capturing stunning night-sky images.
Note: To mount both an ASIAIR and a guidescope simultaneously, you’ll need a second Accessory Rail or the dedicated ASIAIR Mounting Plate.
Press one button and let your setup take care of the rest! With the ZWO EAF and a backlash-free belt drive, you’ll never have to manually focus in the dark again. Wake up to perfectly sharp, high-quality sub-exposures every time.
Get longer exposures, and throw away less images with the power of autoguiding! Easily attach a guidescope, and accessories to your Rokinon lens, like an ASIAIR Plus/Mini (with the optional mounting plate add-on). Alternatively, you can purchase another rail and attach any astro accessory that has a vixen style dovetail instead.
Easily rotate your entire setup in seconds thanks to the detachable belt system. The smart focus ring design allows for quick disconnection and reconnection, offering flexibility in every session.
"⭐⭐⭐⭐⭐ I was initially skeptical about 3D printed components, but I’m genuinely impressed by the design and quality of this ring system. Every piece fits together flawlessly, and the metal screw sockets provide excellent durability and security. The instruction manual is also one of the best I’ve seen - clear, detailed, and easy to follow." – JUN
Astrodymium has earned the trust of astrophotographers worldwide for its precision engineering and reliability. Each Ring System is proudly made in Canada using high-quality stainless steel and aluminum components wherever possible, ensuring strength, accuracy, and long-term performance.
Two precisely engineered rings firmly hold your lens in place, featuring an innovative thumbscrew design that prevents them from falling out during adjustments.
Crafted in Canada from PETG plastic, the system can withstand temperatures from -25°C to 80°C (-13°F to 176°F). All threaded points use stainless steel inserts for corrosion resistance and long-lasting strength.
Includes screws for attaching the rings to any dovetail bar or plate.
➤ Rokinon 135mm F/2
➤ Samyang 135mm F/2
➤ Walimex 135mm F/2
➤ All CINE versions (special adapter required – contact after purchase)
1× Set of front & rear rings with guidescope rail
2× M3×12mm stainless steel thumbscrews
2× M5×12mm button head screws
2× M6×16mm socket head screws (longer screws included with riser block add-on)
ZWO EAF Mount for Astrodymium Ring System includes:
All required fasteners
3D-printed mounting parts
1× Timing belt
1× Metal pulley
Instructions are provided inside the box as an online manual
